How would I parse JSON in Ruby to give me specific output

问题

So I'm trying to make in Ruby so that it "Idk how to express myself" parse JSON from this API so the output is:

{"infected"=>19334, "deceased"=>429, "recovered"=>14047, "tested"=>515395, "tested24hours"=>8393, "infected24hours"=>351, "deceased24hours"=>11, "sourceUrl"=>"https://covid19.rs/homepage-english/", "lastUpdatedAtApify"=>"2020-07-15T14:00:00.000Z", "readMe"=>"https://apify.com/krakorj/covid-serbia"}

and I would like it to only show for example "infected"=>19334, as number 19334

I'm new to Ruby programming I'm still learning it since it's COVID pandemic and lockdown I have more of free time and it kinda makes sense to make something related to it.

This is what I've done so far:

require 'httparty'
require 'json'

url = 'https://api.apify.com/v2/key-value-stores/aHENGKUPUhKlX97aL/records/LATEST?disableRedirect=true'
response = HTTParty.get(url)
re = response.parsed_response
puts re

回答1:

Sure, you do it like this:

re["infected"]
 => 19334

HTTPParty parsed response returns a hash, so you access the value by the key. If the key is a "string", you access using a "string". If they key is a :symbol, you access with a :symbol.

回答2:

Not entirely sure if that is your question, but parsed_response has already parsed the json and converted it into a hash.

So to access the infected field, you can just do

 re = response.parsed_response
 infected = re["infected"]
 puts infected

回答3:

Personnaly, I prefer using 'open-uri'.

require 'open-uri'
require 'json'

url = 'https://api.apify.com/v2/key-value-stores/aHENGKUPUhKlX97aL/records/LATEST?disableRedirect=true'
response = open(url)
json = JSON.parse(response)

puts json["infected"]

-> output 19334

回答4:

require 'httparty'
require 'json'

url = 'https://api.apify.com/v2/key-value- 
stores/aHENGKUPUhKlX97aL/records/LATEST?disableRedirect=true'
response = HTTParty.get(url)
re = response.parsed_response

At this stage we have that output

{"infected"=>19334, "deceased"=>429, "recovered"=>14047, "tested"=>515395, "tested24hours"=>8393, "infected24hours"=>351, "deceased24hours"=>11, "sourceUrl"=>"https://covid19.rs/homepage-english/", "lastUpdatedAtApify"=>"2020-07-15T14:10:00.000Z", "readMe"=>"https://apify.com/krakorj/covid-serbia"}

You can access any above variable value like that

infected = re["infected"]
deceased = re["deceased"]

And so on..

来源：https://stackoverflow.com/questions/62916858/how-would-i-parse-json-in-ruby-to-give-me-specific-output

标签

json

ruby

parsing

output

httparty